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<h1 class="topictitle1">手动执行备份</h1>
<div><p>当您需要立即执行一次备份任务时，可以通过手动备份实现。</p>
<div class="section"><h4 class="sectiontitle">前提条件</h4><p id="ZH-CN_TOPIC_0000001792388956__zh-cn_topic_0000001839268029_p169831037318">GaussDB T单机数据库备份的前提条件如下：</p>
<ul id="ZH-CN_TOPIC_0000001792388956__zh-cn_topic_0000001839268029_ul1683211311223"><li id="ZH-CN_TOPIC_0000001792388956__zh-cn_topic_0000001839268029_li1832131323">请确保GaussDB T数据库运行状态正常。</li><li id="ZH-CN_TOPIC_0000001792388956__zh-cn_topic_0000001839268029_li35049413312">如果需要进行全量备份或日志备份，请确保备份前已开启日志归档。</li></ul>
<p id="ZH-CN_TOPIC_0000001792388956__zh-cn_topic_0000001839268029_p15408848124412">GaussDB T集群数据库备份的前提条件如下：</p>
<p id="ZH-CN_TOPIC_0000001792388956__zh-cn_topic_0000001839268029_p636716152451">数据库需要在ARCHIVELOG模式下运行，并将Redo日志存档至多个位置。查询和修改日志归档模式，请参见<a href="zh-cn_topic_0000001839268009.html">步骤2：设置Redo日志模式</a>。</p>
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<div class="section"><h4 class="sectiontitle">注意事项</h4><p id="ZH-CN_TOPIC_0000001792388956__zh-cn_topic_0000001839268029_p5298101017162">全量备份失败后，如果下一次备份是日志备份，由于日志备份依赖上一次成功的全量备份副本，该日志备份任务将失败。此时，请手动执行一次全量备份。</p>
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<div class="section"><h4 class="sectiontitle">背景信息</h4><ul><li>手动备份时，SLA中定义的参数（<span class="uicontrol">“<span>失败后自动重试</span>”</span>除外），如<span class="uicontrol">“<span>限速策略</span>”</span>会应用到手动备份任务中。</li><li>手动备份产生的副本保留时长按照SLA中的定义进行保留。</li></ul>
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<div class="section"><h4 class="sectiontitle">操作步骤</h4><ol><li><span>选择<span class="uicontrol" id="ZH-CN_TOPIC_0000001792388956__zh-cn_topic_0000001839268029_zh-cn_topic_0000001792388936_zh-cn_topic_0000001839142377_uicontrol174093353365">“<span id="ZH-CN_TOPIC_0000001792388956__zh-cn_topic_0000001839268029_zh-cn_topic_0000001792388936_zh-cn_topic_0000001839142377_text164093351368">保护</span> &gt; 数据库 &gt; GaussDB T”</span>。</span></li><li><span>在需要备份的数据库所在行单击<span class="uicontrol">“<span>更多</span> &gt; <span>手动备份</span>”</span>，支持多个资源同时进行手动备份。</span></li><li><span>设置手动备份产生的副本名称。</span><p><p>如果您不设置，系统默认设置副本名称为：backup_时间戳。</p>
</p></li><li><span>选择保护策略：<span>全量备份</span>、<span>增量备份</span>、<span>差异备份</span>或<span>日志备份</span>。</span><p><div class="note"><img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span><div class="notebody"><p><span>增量备份</span>、<span>差异备份</span>仅适用于GaussDB T集群类型的备份场景。</p>
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</p></li><li><span>单击<span class="uicontrol">“<span>确定</span>”</span>。</span></li></ol>
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<div class="parentlink"><strong>父主题：</strong> <a href="zh-cn_topic_0000001792548680.html">步骤7：执行备份</a></div>
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